Joe - I had previously bought a new 160 thermostat and tested it with a candy thermometer.

I took the radiator to a different shop (in the big city- Dayton). They said after they cleaned it the flow increased about 25%. They also fixed a couple small leaks. They also recommended cleaning out the water passages in the block before I put the radiator back.
At the moment the head is off (at the shop getting milled, so the head will be nice and clean). Should I clean the block before I put the head back on, or is that even possible? If so, how? ( I've read the posts about the petcock in the block, so I know where it is and how I might have to remove it and use a coat hanger to get things started).


My dad always told me, "Don't force it, get a bigger hammer".